hobbit hierachy

Does hobbit work off of a parent/child relationship with hosts?  Say i  have a router at a site and 20 or so devices off of that router.  If  the router goes down will i get a page from all 20 something devices  or can i set it up to where if that happens that i only get a page  from the router.  By the way Henrik, great job on bbgen/bb integration  with Hobbit.  This is fairly easy to setup and comes with alot of pre- packaged things that is really nice.  Great Job!!!!!

Josh